Cotton Sun Hat Oat by Kiln. The Kiin cotton sun hat has been designed with comfort & sun safety as priority - made from 100% cotton and featuring a broad brim for excellent sun coverage. There are adjustable toggles at the back of the head & under the chin, to ensure a snug & secure fit, especially during play & windy weather! it's a must have for any outdoor adventures!S - 48cm (suitable for approximately 6 - 12 months)M - 52cm (suitable for approximately 1 - 3 years)